Jokosher - Jokosher is a simple and powerful multi-track studio.
LMMS - Make music with a free, cross-platform tool
SoX - Sound eXchange is a command line utility that can convert various formats of computer audio files...
DSP-Quattro - DSP-Quattro
Fission - Edit audio in minutes, not hours.
Audio Cleaning Lab - Looking to clean up your song recordings? Download SOUND FORGE Audio Cleaning Lab, the professional solution for cleaning & restoration with advanced ProAudio technology.